ABB PM862K02 3BSE081636R1 AC 800M Redundant Processor Unit

The ABB PM862K02 3BSE081636R1, also cataloged as the PM862K02 Redundant Processor Unit, operates as a dedicated hardware component for executing high-availability process control algorithms within ABB AC 800M and System 800xA control networks. Powered by an MPC866 processor running at 67 MHz, the dual-CPU assembly executes application execution down to 0.18 ms per 1,000 Boolean operations. Connected via a high-speed RCU-Link cable, the redundant processor pair synchronizes memory content to achieve smooth controller switchover in less than 10 ms upon primary hardware failure.

Suffix Breakdown & Model Matrix

The PM862K02 designation specifies a complete redundant controller package containing all essential baseplates and inter-module cables for redundant system installation.

• PM862: Individual base processor module featuring a 67 MHz MPC866 CPU, 32 MB onboard memory, dual Ethernet ports, and two RS-232C serial ports.
• K02: Redundant kit configuration suffix, indicating a matched pair of PM862 processor modules bundled with redundancy interconnect accessories.
• 3BSE081636R1: Specific ABB ordering commercial part number for the dual-CPU assembly package.
• Kit Components: The package includes 2 x PM862 CPUs, 2 x TP830 baseplates, 2 x TB807 ModuleBus terminators, 1 x TK850 CEX-bus extension cable, 1 x TK851 RCU-Link cable, and 2 x lithium backup batteries (system software license sold separately).

Hardware Specifications

Backplane Bus Communication Velocity & ModuleBus Supervision

The PM862K02 coordinates high-velocity backplane communication across the CEX-Bus and internal ModuleBus interfaces, supervising up to 84 I/O modules under redundant configuration. Utilizing its dedicated 100 Mbit/s RCU-Link interface, the primary CPU streams cyclic data updates and execution state mirrors to the backup CPU without impacting main application scan rates. The hardware monitors backplane communication integrity, triggering automatic channel switchover when hardware communication faults are detected across the backplane bus. Firmware compatibility requires system software 800xA 6.0.2 or Compact Control Builder 6.0.0-1 and higher.

Frequently Asked Questions

Q: What happens to the process outputs during a CPU switchover event?

A: The redundant CPU pair executes internal memory mirroring via the TK851 RCU-Link cable, allowing the secondary processor to assume control within 10 ms, maintaining uninterrupted signal states on field I/O channels.

Q: Can an individual PM862 CPU module be replaced while the remaining unit is running?

A: Yes, the redundant processor configuration allows for the removal and replacement of a failed secondary CPU or baseplate component while the primary CPU maintains active execution, provided the RCU-Link and power connections are handled according to standard maintenance protocols.

Q: How does the backup battery protect application software during supply outages?

A: The included 3.6 V lithium backup battery powers the static RAM array during main 24 VDC power loss, retaining system data, user application logic, and real-time clock parameters for the duration of the battery shelf life.

Field Installation Guidelines

Mount the TP830 baseplates vertically on standard 35 mm DIN rails inside an IP20-rated enclosure, providing a minimum vertical clearance of 50 mm above and below the assembly for natural convective cooling. Interconnect the primary and secondary baseplates using the TK851 RCU-Link cable, ensuring the locking mechanisms click into place to maintain high-speed synchronization. Connect the TB807 ModuleBus terminators to the last active positions on the ModuleBus interface to eliminate signal reflection across backplane communication paths. Ground the shield wires of all communication lines, including CEX-Bus extension cables, directly to the panel earth bar using low-impedance grounding clamps to prevent high-frequency noise interference.